基于PXI的长时间低零漂斩波式积分器

A Digital Long-Time and Low Drift Chopper Integrator Based on PXI

为了避免传统模拟积分器积分电容泄漏,减小简单数字式积分器前端模拟器件的固有噪声及A/D的量化等误差,设计了基于PXI的长时间低零漂斩波式积分器系统。该系统由PXI机箱、数据采集卡和前端信号处理模块组成硬件平台,对信号进行调理和采集,采样率达到200 kS/s,LabVIEW语言和RTX实时系统构成软件设计平台,对信号进行积分、实时扣除零漂等软处理。通过对系统的测试,此积分器有效地降低了零点漂移,比传统模拟、数字积分器具有更加优越的性能。

The digital long-time integrator with a chopper input stage is designed based on PXI to avoid nonlin- ear error, capacity leakage of traditional analog integrator and quantization error of front A/D of simple digital integrator. The hardware platform with PXI chasis, data acquisition board and front signal processing module is designed. The LabVIEW language and RTX real-time system are used for software design platform. The signals processed and acquired at 200 kS/s are integrated and its drift is reduced by LabVIEW in RTX real-time sys- tem. By testing the system, the zero drift of the integrator is effectively reduced, which has more excellent per- formances than traditional analog and digital integrator.